Perhaps you can confirm with a pic of your latches, that triangular sheet metal paint shields were pushed into the door latch to prevent the paint from entering the inner latch area. Typically, there will be some body color paint overspray on the back side of the latch as shown below. The three screws that secure the latch should also be the body color; a small detail that many overlook during restoration.

Also, the trunk lid was attached and aligned in the body shop prior to the body color paint. Thus, the trunk lid hinges and associated attachment screws should also be the body color. Another mistake sometimes overlooked during restorations.

I don't think shields were used. The latches came all greased up from the manufacture and had a cosmoline type coating on them. I believe the paint simply didn't stick to them and when the cars were prepped, and with years of use, it just came off. if you look real close at the actual lock pawl in your pic, there's still a hint of paint on it which would suggest they were not shielded.

I don't think shields were used. The latches came all greased up from the manufacture and had a cosmoline type coating on them. I believe the paint simply didn't stick to them and when the cars were prepped, and with years of use, it just came off.

That's correct - no shields were used; the latch was oily, and the paint just fell off.